Street sweeper dirt box assembly



1964 R. F. SCHMIDT ETAL STREET SWEEPERDIRT BOX ASSEMBLY Filed April 14, 1964 4 Sheets-Sheet l INVENTORS ROBERT F. SCHMIDT HENRY A, LEIDECKER BY DONALD G. KIRK ATTOR EYS Dec. 29, 1964 R. F. SCHMIDT ETAL 3,162,377

STREET SWEEPER DIRTBOX ASSEMBLY 4 Sheets-Sheet 2 Filed April 14, 1964 INVENTORS ROBERT F.- SCHMIDT HENRY Av LEIDECKER DONALD c. KIRK A TORNEYS Dec. 29, 1964 Filed April 14, 1964 R. F. SCHMIDT ETAL STREET SWEEPER DIRT BOX ASSEMBLY 4 Sheets-Sheet 3 I NVENTORS 1964 R. F. SCHMIDT ETAL 3,162,877

STREET SWEEPER DIRT BOX ASSEMBLY Filed April 14, 1964 4 Sheets-Sheet 4 INVENTORS ROBERT F SCHMIDT HENRY A. LEIDECKER BY DONALD c. KIRK ATT RNEYS United States Patent O 3,162,877 STREET SWEEPER DIRT BOX ASSEMBLY Robert F. Schmidt, Elgin, Henry A. Leidecirer, Wheaten, and Donald G. Kirk, Elgin, 131., assignors to Elgin Sweeper Company, Elgin, 111., a corporation of Delaware Filed Apr. 14, 1964, Ser. No. 359,699 20 Claims. (Cl. -83) The present invention relates generally to a new and improved street sweeper. More particularly, this invention relates to a street sweeper having new and improved mechanisms for dumping a dirt hopper at a street level position or at an elevated position to permit sweepings to be loaded into a truck standing by or to be stacked in large rather than small piles. Still another important object of this invention is to provide a street sweeper which can also be operated as a front end loader for loading the sweepings directly into a truck.

A very important object of this invention is to provide a street sweeper having a front end unloader which has excellent stability during the dumping cycle without requiring any counterbalancing of the load in the dirt hopper.

A still further object of this invention is to provide a street sweeper with a front end unloader whereby the dirt hopper can be raised to an elevated position and then moved through an are away from the sweeper so that the sweepings can be dumped as the gravity actuated door is swung open. An important advantage of the present sweeper over prior art sweepers is that the maximum load in the dirt hopper is at no time located at the maximum extended position of the hopper during the dumping cycle, for when the dirt hopper is moved through the are in the dumping position the dump door is simultaneously opening and the sweepings are being unloaded.

An important object of this invention is to provide a new and improved dirt hopper handling mechanism which is of compact construction so as to occupy the smallest possible area in order that a larger sized dirt hopper can be used.

Another important object of this invention is to provide a new and improved dirt hopper handling mechanism which will not interfere with the operators view and which can be operated to unload a dirt hopper from an elevated position or at ground level. By providing a sweeper that can be unloaded from an elevated position, the sweepings can be unloaded directly into a truck or any other suitable vehicle standing by tominimize the handling of the swept materiaL,

Yet another important object of this invention is to pro- H vide a new and improved street sweeper which is of such construction so as to permit the operator to elevate the dirt hopper from the operators seat so that the operator can then visually determine whether the dirt hopper is fully loaded. In the past, where the operator wishes-todetermine whether the dirt hopper is fully loaded, it has been necessary for him to step down off the sweeper and open a side door in the dirt box in order to inspect the contents of the hopper. v

In the past, especially in large city areas, the effectiveness of street sweepers has been reduced, for a great amount of time has been and still is being consumed by the sweepers in transporting loaded dirt hoppers to remote or rural dump areas. By using the sweeper for long daily periods as a truck rather than as a sweeper, the effectiveness of each sweeper is reduced. According to another important object of this invention, our sweeper is provided with a dirt hopper which can be used as a front end loader by operation of a new and improved dirt hopper handling mechanism. It is now possible with our new sweeper to unload a filled dirt hopper into a truck or on the street in the area being swept so that the sweeper can be continuously used as a sweeper for longer periods. If a truck or other suitable hauling means is unavailable when the dirt hopper becomes fully loaded, the dirt can be dumped until a truck becomes available at which time the dirt hopper can be utilized as a front end loader to pick up and load the previously dumped sweepings into the truck.

- According to important features of this invention, the dirt hopper handling mechanism includes a pair of dirt hopper carrying beams on opposite sides of the dirt box and means for elevating the dirt hopper carrying beams and means carried by the beams for rotating the dirt hopper to unload the same.

According to more specific features of this invention, the means for elevating the dirt hopper carrying beam and the means carried by the beam for rotating the dirt hopper are all disposed in a common vertical plane so as to occupy the least possible amount of space in order that the capacity of the dirt hopper may be maintained as large as possible.

According to other important features of this invention, the dirt hopper is provided with a sweepings inlet that is partially defined by a scoop so that when the dirt hopper is rotated, the dirt hopper can be used as a front end loader.

Other objects and features of this invention will more fully become apparent in view of the following detailed description taken in conjunction with the accompanying drawings illustrating therein a single embodiment and in which:

On the drawings: 7

FIGURE 1 is a side elevation of a street sweeper;

FIGURE 2 is an enlarged fragmentary perspective view of the street sweeper shown in FIGURE 1 withparts broken away to illustrate adirt hopper handling mechanism embodying important features of this invention;

FIGURE 3 is an enlarged fragmentary View similar to FIGURE 2 only illustrating the manner in which the dirt hopper can be rotated or moved through an arc to unload sweepings; Y 7

FIGURE 4 is an enlarged fragmentary view similar to FIGURES 2 and 3 only illustrating the manner in which the dirt hopper handling mechanism may be operated to elevate and then rotate the dirt hopper to unload the sweepings into larger'sized piles;

FIGURE 5 is an enlarged fragmentary side elevation of the street sweeper shown in FIGURE 1 illustrating in full and dotted lines the manner in which the dirt hopper handling mechanism can be operated to unload the dirt hopper;

FIGURE 6 is an enlarged fragmentary side elevation illustrating in full and dotted lines the manner in which the dirt hopper handling mechanism can be operated to place the dirt hopper in a position so that it can be used as a front end loader; and

FIGURE 7 is a top plan view of the street sweeper shown in FIGURE 1.

As shown on the drawings:

A street sweeper 10 is illustrated as having a sweeper body 11 supported on front and rear wheels 12 and 13. One or more side brooms 14 and a main broom 15 are provided for depositing sweepings onto a conveyor 16 (FIGURE 5) so that the sweepings may be deposited into a dirt hopper 17. The controls for operating the sweeper 10, the brooms 14 and 15, the conveyor 16 and the dirt box 17 are operable from an operators seat 18 (FIGURE 7).

The dirt hopper 17 has a bottom 19, an upwardly inclined forward wall 20 and an upwardly and rearwardly inclined wall 21 with a hopper door 22 pivotally ioined r v V 3.

at its upper end by means of hinges 23. A hopper scoop 24 lies in the plane of the upwardly and rearwardly inclined wall 21. The scoop 24 further defines a sweepings inlet 25 (FIGURE; 6). The dirt hopper17 iurtherin cludesfa rear wall 26 and side walls 27. When the dirt hopper is in-sweeping. position, the scoop snugly cooperateswith upper sweeper body wall 28m prevent dust from escaping the dirt hopper 17 as it is being loaded'by the conveyor16.

The sweeper body l l additionally includes side body portions 30 and 31 which are joined with the upper sweep-' or body wall 28 and extend forwardly ithereof to define a dirt hopper housing 32 (FIGURE '4). In orderto mountthe dirt hopper 17 on the machine, "we havedeveloped a new'and improved dirt hopper handling mechanism or apparatus embodying important features of this invention. This; apparatus or mechanisrn includes the following described components. A pair ofdirt hopper carrying-hollow side, beams or-arms 33 and 34are pivotally joined to the side body portions 39 and 31st "pivots"35 and The beams 33; and 34 are joined at oppositeends. with theside walls 27 of the dirthopper .17 at pivots 37 and 38.

"A pair offluid cylinders 9i= having ran-15 41 and 42 a re provided for raising and lowering the beams '33 and 34 and the dirt hopper 17- carried thereon, "I-fhe cylinders 39 and 4am each pivotally'supported on pivots-43 at one end on-the sweeper body 11 and the rams 41 and 42' eacli' project into aihollow area 45 of the associated beam. The rams 41 and'42 are joined with-the beams at pivots 44. Each of the rams andits associatedcbeam aredisposed in a common vertical planeso that-the elevat- ,ing mechanisms may be as co p ct la ibl B a "providing compact elevating mechanisms,theylargest possible dirt hopper 17 may be used on the sweeper machine 10. o c

Linkage and means are-also provided to roll over or for rotating the dirt hopper17 on thebeams 33' and 34 to dump the" contents ofthe hopper past the swingingdoor :ZZ thrOugh the dirt box outlet. This linkage and dirt hopper rotating means at each side of the dirt'hopperare also disposed in vertical planes common witlrthe vertical planes of the beams 33 andi34 for compactnessias previously desc ribed. To this end, identical linkages-581and 51 are provided on opposite sides of the-dirthopper17. Since the linkages 50 and-51are identical a description of one will suffice for both.

The linkage 51 includes a pair of first spaced-parallel links 53 (FIGURE which are-joined at one; end 'at pivots 54 to opposite sides of the associated beam'34. V A second -link55 joined-atone end at pivot56 between and with opposite'ends of the spaced links 53 and at an opposite end at pivot 57 with the side wall 27 of the dirt hopper 17.

Mounted on the beams'33 and34 and cooperablewith the linkages 50 and 51 are a pair'of fluid cylinders '60 and 61 (FIGURE 7) for rotating thedirt-hopper 17. -The cylinders 60 and Glarepivotally joined with the beams 33' and 341 at pivots6 4 and 65: and the rams-62' and-'63 are'pivotally joined with the linkages 5i): and-51 at pivots 66 and 67 and more particularly with the'links' 53.

The scoop 24 also serves another important function in that it provides a body-housing: closure to prevent dust from escaping from thesweeperas the machine is being used to sweep; the streets. -Itwillbe appreciated that the scoop 2 4'rnay be eliminated, if-desired,-as-the scoop is an optional feature.

Some of the advantages of our; newsweeper are evident from the drawings wherein the difierent-usesgof themachineare illustrated. FIGURE 5 illustrates the manner -in which the dirt hopper 17 can be elevated-and dumped so that sweepings may be dumped directly into a truck,

or railroad car or other type vehicle so that a savings 'may be effected in the handling of the sweepings. Where a truck'is unavailable the sweeping s can bedumped'into large piles rather than in many small piles. Either type of operation is particularly useful in .city areas where dump areas are scarce and expensive. By providing a sweeping machine that can dump in such a way that large piles can be produced, the dump areas can be more efiiciently utilized. 'When' the dirt hopper 17 is turned upside down, the 'door 22 flops-open and the contents er the hopper are emptied. I c

FIGURES Z and 3 illustratethe-manner inyvhih the dirt hopper 17 can be emptied Where it is notdesired to unload the dirt hopper'17 iro'm'an elevated position, such as on a windy day. a

Our sweeper machine 16 can also be eftectively used as a front end loader forfdozing or. pickup operations if desired, as illustrated in FIGURE 6. I Where the machine sweeper sincethe travel time "as a'loaded sweeper from the sweeping area to a dump area can be greatly reduced. The loaded sweeper can 'dumpdir'ectlyjinto a truck or -dump locally in the streets until trucks arrive to. carry be the'iac'cuniula'ted'sweepings. W hen hauling vehicles fbe- .comeavailable the front end loader on the sweeper "can be used to pickup 'the' piles of sweepings and load them thereon. In the past, especially around large cities,

it has been necessary 'for the sweeper operators rte-drive .flongidistan'ces to'durnp loaded dirt hoppers, thus reducing the amount of'tirne per day that thesweeper could be used in sweeping the streets.

Y'When the hopper has a maximum load and itis-felevated thecent'erfof gravity of-the load is maintainedin close proximity to the s'u'leeperso that the .load will be -stabilized at alltiines and so that itfis not necessary to provide *iaccessory counterbalancing' means .on the 0p- 7 'pos'ite end ofthe sweeper. When the hopper is unloaded "hopper. is being" rotated.

and rotated away'from thesweeper the balance. of the sweeper is not upset asthe hopper is unloaded while the 7 Although minor 'modifications. mightbe suggested by those versed in the art, it should -be understood that we "wish .to embody within'the scope ofthe patent warranted hereon, all such modifications as -reasonably and properly come within the scope-oi our contribution to the art. 1 We claim as our invention: V

1. In combination in a street sweepingmachine,

a body having a pair of -spaced side body portions dis-- posedata forwardcend of the sweeper defining-an upwardly and forwardly-opening dirt hopper housing,

means for sweeping a surface over which the machine is direc'tedjand delivering the sweepings to said dint hopper housing, I a dirt hopper-disposed in said-housing and having a swiI ga-bly mounted hopper door extended along an flipper surface of the. dirt hopper and havinga sweepings inlet positioned rearwardly of the swingable door for receiving sweepings from said means, K means comprisingv a pair of hollow side arms for sus pending the dirt hopper from the machine with said arms being mounted on arm pivots at rearward ends on said side body portions and pivotally attached at opposite ends with opposite sides of said dirthopper,

means forpivoting'saidarmson said arm-pivots for raising andlowering said dirt hopper comprising a first pair of fluid cylinders each attached to said body and having a ram extended into a'hollowzarea in an associated one of said hollow side arms and ,5 joined in coplanar relation therewith for compactness, and

means coplanar with said arms for rotating said dirt hopper on its pivots where joined with said hollow side arms comprising linkage on opposite sides of said dirt hopper joining said arms with said hopper and a second pair of fluid cylinders including a second pair of rams with said second pair of fluid cylinders joined at ends with said arms and with said second pair of rams joined at opposite ends with said linkages whereby the dirt hopper may be elevated and moved through an arc to turn the dirt hopper upside down to allow the hopper door to swing open for the sweepings to fall through a discharge outlet.

2. In combination in a street sweeping machine, a body provided with an upwardly and forwardly opening dirt hopper housing, a

a dirt hopper disposed in said housing and having a swingably mounted hopper door extended along an upper surface of the dinthopper and having a sweepings inlet positioned rearwardly of the swingable door for receiving sweepings,

a scoop mounted over said inlet to permit the dirt hopper to be used as a front end loader,

means comprising a pair of side arms for suspending the dirt hopper from the machine with said arms being mounted on arm pivots at rearward ends on said body portions and pivotally attached at opposite ends with opposite sides of said dirt hopper,

means for pivoting said arms on said arm pivots for raising and lowering said dirt hopper comprising a first pair of fluid cylinders attached to said body and having rams attached to said side arms on opposite sides of said hopper and disposed in coplanar relation with said arms therewith for compactness, and means coplanar with said arms for rotating said dirt hopper on its pivots where joined with said side arms comprising linkage on opposite sides of said dirt hopper joining said arms with said hopper and a second pair of fluid cylinders including a second pair of rams with said second pair of fluid cylinders joined at ends with said arms and with said second pair of rams joined at opposite ends with said linkages whereby the dirt hopper may be elevated and moved through an arc to turn the dirt hopper upside down to allow the hopper door to swing open for the sweepings to fall through a discharge outlet.

3. The combination of claim 2 further characterized by the body being provided with means for holding the hopper door in a closed position when the CL'nt hopper is to be used as a front end loader.

4. The combination of claim 2 further characterized by said'scoop being snugly fitted with said body in overlying relation with respect to the conveyor to provide a closure for preventing dust and sweepings from escaping through the dirt hopper housing.

5. In a street sweeping machine, a body provided with an upwardly and forwardly opening dirt hopper housing, means for sweeping a surface over which the machine is directed and delivering the sweepings to said dirt hopper housing,

a dirt hopper disposed in said housing and having a swingably mounted hopper door extended along an upper surface of the dirt hopper and having a sweepings inlet positioned rearwardly of the swingable door for receiving sweepings from said means,

means comprising a pair of side arms for suspending the dirt hopper from the body with said arms being mounted on arm pivots at rearward ends on said body and pivotally attached at opposite ends with opposite sides of said dirt hopper,

means for pivoting said arms on said arm pivots for raising and lowering said dirt hopper comprising a first pair of fluid cylinders pivotally attached to said 6 body and to said side arms and joined in coplanar relation therewith for compactness, and means coplanar with said arms for rotating said dirt hopper on its pivots where joined with said side arms comprising linkage on opposite sides of said dirt hopper joining said arms with said hopper and a second pair of fluid cylinders joined at ends with said arms and joined at opposite ends with said linkages whereby the dirt hopper may be elevated and moved through an arc to turn the dirt hopper upside down to allow the hopper door to swing open for the sweepings to fall through a discharge outlet.

6. A street sweeper comprising,

a body having a body opening for a dirt hopper,

a dirt hopper provided with a sweepings inlet mounted in said body opening,

a scoop'provided on said dint hopper adjacent said sweepings inlet,

means joining said dirt hopper with said body for elevating said dirt hopper,

means for directing sweepings into said sweepings inlet, and

means for moving said dirt hopper in an arc to position said scoop at ground'level enabling the dirt hopper to be used as a front end loader.

7. In a street sweeping machine,

a body provided with an upwardly and outwardly opening dirt hopper housing,

a dirt hopper disposed in said housing and having a swingably mounted hopper door extended along an upper surface of the dirt hopper with the door mounted over a discharge outlet,

the hopper having a sweeping inlet positioned rearwardly of the swingable door for receiving sweepings,

means comprising a pair of side arms for suspending the dirt hopper from the machine with said arms being mounted on arm pivots at rearward ends on said body and pivotally attached at opposite ends with opposite sides of said dirt hopper,

means for pivoting said arms on said arm pivots for raising and lowering said dirt hopper and disposed in coplanar relation with said arms for compactness, and

means coplanar with said arms for compactness for rotating said dirt hopper on its pivots where joined with said side arms causing the dirt hopper to be moved through an arc to turn the dirt hopper to allow the sweepings to fall through said discharge outlet.

8. In a street sweeping machine,

a body provided with an upwardly and outwardly opening dirt hopper housing,

a dirt hopper disposed in said housing and having a discharge outlet and a swingably mounted hopper door covering said discharge outlet and having a sweepings inlet positioned adjacent the swingable door for receiving sweepings,

means for conveying sweepings through said inlet,

means comprising a pair of side arms for suspending the dirt hopper from the machine with said arms being mounted on arm pivots tat rearward ends on said body and pivotally attached at remote points with opposite sides of said dirt hopper,

means for pivoting said arms on said arm pivots for raising and lowering said arms and said dirt hopper, and means for rotating said dirt hopper on its pivots where joined with said side arms outwardly and away from outer ends of said side arms to turn the dirt hopper to position said discharge ouelt for dumping.

9. In a street sweeping machine,

a body defining an upwardly and outwardly opening dirt hopper housing,

a dirt hopper disposed in said housing and having a swingably mounted hopper door and a sweepings "means coplanar with said arins for pivoting said dirt oiitl'et covered "thereby andhaving a sweepings inlet positioned'adjacent the sWingable door, means for 's'weeping'a'surfaee over which the'rri'a'chine is'dir'ec't'ed :and'de'livering the sweepin'gs through said 's'weeping's'inlet, l means oomprisi'ng'ja' pair of side'arms pivotally joined With the body andwith the dirt hopper, means for pivotingsaid arinsior raising and'lowerv ingl saiddint hopper and positioned in coplanar relag tiOIfW-lili said arms, and V hopper outwai'dlyaway 'fromonter' endsbf said side arms comprising linkage on oppositesides 'of'said dirt 'hopp'er joining said armslwithsaid hopper'and e'ans joining 'saiddirth pper said bodyifor-e'levating dirt ihopper and with said dirt hopper having pivots' on opposite "sides "disposed generally apair of fluid cylinders joined Withsaid' arms and With said linkages .to turnthe dirt' hopper to position said syveepings'outlet forclurnpi'ng. 10. A streetsweepizr comprising,

' abody, v v a dirt hopper provided vyith sweepingsinlet and a discharge outlet adjaoentthereto,

beneath the hopper doorand meansforrotating saiddirt liopperonitsipivots *through body causing, the hopp er door to be' moved an are from a Closed top side position toagravity-unloading position'wh'er'e-by thecontents of the hopper can fall tree of the" hopper upon pivoting of the nieansfor directing swteepingsinto said sweepin'gs inlet, hopper'door. "arni'nie'ans joining said dirt hopper Withsaid body, 16. A street sweeper-comprising, meansf'or'elevatiiigsaiddirt hopper, and a body,

means for turning saididirt hopper over andoutwardly v beyondsaid arm means toplace the'fiirt hopper in an'unloading position. 11. A street sweeper comprising, 7 b a body having a body opening for a dirt'hopper, a dirt hopper provided'with asweepings inlet'mounted "39 in 'said' body openingand, a1.grayity operated door adjacent thereto that 'is'normally closed, fimeans'for directing sweepingsinto said sweepings inlet, arrn'means joining said d-i-rthopper with said body and means for elevating said dirt hopper,"and '35 means for moving said dirt'hopper in an arc in a direction away fro'm said body causing said gravity operated'door to swing open'to unload the dirt hopper. 12. "A'street sweeper'comprising, a body having a bodyopening for. adirt hopper, 40

a dirt-hopper providedwith a 'isweepin'gs inlet'monnted in said body opening and a gravity operated dolor adjaoent thereto that is normally closed, means for directing syveepings into said sweepings inlet, arm means joining 'said'jdirt hopper With said body merit to said body, a scoop provided on I said dirt hopper positioned to allow said'sooop to lo ad 's aid hopper, means for directing sweepings into said sweepings inlet, means joining said dirt hopper with said body,

' said hopper, and g r 7 means for "moving said dirt'dio'pper to position said used as a front end loader. 17. 'Astreet sweeper comprising, dY a dirt hopper provided'with a sweepings inlet,

-mea'ns for direbting sweepings into said sweepin'gs'inlet, aig'ravity operated door on an upper end of said dirt hopper disposed in a closed position wliile' loading said hoppervvith'sweepings, i arm 'rneans joining said" dirt hopper-With said body, means for elevating s'aid dir't liopper, -and means for rolling over said dirt hopper'and said gravity and means for elevating said dirt hopper, and operated 'door relative to said Jarm means in are means for moving said dirt hopper'relative to said arm in a'direction away f'rom said body for unloading the means in an arc'in a direction awiayifrom' said body dirt hopper as the door is moved from a Closed posicausingsaid gravity operateddoor' to swing open to p p s i nunload the dirt hopper when the dirt hopper is in an ls-l'Aisifeei p r P g, f elevated position orwhenthe dirt hopper'is disposed a body, at ground level. V a dirt hopper providedv'rith aisweepings inlet, 13. A front end unload er comprising, supp o'rt meansjoiningsaiddirt hopperwith said body, a'body having a body opening for a dirt hopper, means-for directing'sweepings into sweep'ings inlet, a'dirt hopper provided with a sweepings inlet mounted I adump door positiond generally top side oi thedirt in saiclb'odyopening, I hopper, V b means for directing sweepings into said'sweepings inlet, means for elevating said dirthopper; and

means including arm rneans jo -iningfsaid dirt hopper ineans'for roliingoversaid' dirtihopperrelative to said with said' body for elevating saiddirt hopper, and "support means in adire'cti orr away fromsaid body means for rolling over said dirt hopper realtiveito said "p g h dirt F1 and'ii'tsdool' Wpcsition 1 arm means in a direction away from the body and for dtunping. a V fior positioning the dirt hopper outwardly of said arm 19. A front end unloader comprising, -rneans in an 'unloadingposition so'thatsweepi-ngs can I a' Y be unloaded free ofthe body. adirt hopper provided with a svveepings inlet, 14. In a street sweeper comprising, arm'means joining 'sa-id' dirthopper with saidbody,

a body having a body opening for a dirt hopper, a dirt hopper provided with a sweepings inlet mounted in said body-opening along a rear edge of the hopper, 'means for directing sweepings into said sweepings inlet, a hopper door pivotally mounted generally on atop means cooperable with said means? for elevating said dirt hopperfiand relative to's'aid arm means to position thedirthopper side of said dirt hopper, 3 a in an unloading position. I i g means joining said dirt hopper with'said'body for ele- 20. Ina street sweeping machine,

vating said dirt hopper, and a body defining an upwardly .and' outwardly. opening dirt hopper housing,

'means for rotating said dirt hopper through an are a'dirt hopper disposed in said housing and having a in a direction outwardly and awayrirom the body 7 an arc in adirectionoutwar'dly and away frorn the a dirt hopper'provided ivith asiveepi-ngs inlet-for elttachv means forel'evating said dirt hopper when unloading seoop at'gronnd level enabling the dift hopper to be means for direetin'gsweepings' into said sweepings inlet,

mean's for rollingover and outwardly said dirt hopper swingable discharge door and a sweepings inlet positioned adjacent the swingable door,

means for sweeping a surface over which the machine is directed and delivering the sweepings through said sweepings inlet,

means comprising a pair of side arms pivotally joined with the body and with the dirt hopper,

means for pivoting said arms fior raising and lowering said dirt hopper and positioned in coplanar relation with said arms, and

means coplanar with said arms for rolling over said dirt hopper outwardly away from outer ends of said side arms for moving said hopper into an unloading position comprising linkage on opposite sides of said dirt hopper joining said arms with said hopper.

References Cited by the Examiner UNITED STATES PATENTS CHARLES A. WILLMUTH, Primary Examiner. 

6. A STREET SWEEPER COMPRISING, A BODY HAVING A BODY OPENING FOR A DIRT HOPPER, A DIRT HOPPER PROVIDED WITH A SWEEPINGS INLET MOUNTED IN SAID BODY OPENING, A SCOOP PROVIDED ON SAID DIRT HOPPER ADJACENT SAID SWEEPINGS INLET, MEANS JOINING SAID DIRT HOPPER WITH SAID BODY FOR ELEVATING SAID DIRT HOPPER, MEANS FOR DIRECTING SWEEPINGS INTO SAID SWEEPINGS INLET, AND MEANS FOR MOVING SAID DIRT HOPPER IN AN ARC TO POSITION SAID SCOOP AT GROUND LEVEL ENABLING THE DIRT HOPPER TO BE USED AS A FRONT END LOADER. 